CopyBuffer can't catch the data?

[Kevin Z]

Does anyone know why, CopyBuffer can't catch the data? (CopyBuffer returns -1, I use GetLastError to check the error code is 4806)

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int OnInit()
{
Handle_ATR=iATR(_Symbol,PERIOD_D1, 1);
}
int OnCalculate(......)
{
  CopyBuffer(Handle_ATR,0,0, 1, atr);
}

[Vladimir Karputov]

Kevin Z :

Does anyone know why, CopyBuffer can't catch the data? (CopyBuffer returns -1, I use GetLastError to check the error code is 4806)

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Example: getting iATR data from a custom indicator.